Surname Silwia (Silwia 
) , around the globe, is a very rare family name. The family name Silwia is habitual in Poland, where it is a very rare surname, Spain, and Mexico, where it is an extremely rare surname. More frequently, Silwia is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Silwia | Spain, India, United States, Poland, Brazil |